iPhoneOS vs iPhone Simulator Framework Differences

macrumors newbie

Is it just me or are there huge differences between the various frameworks in the iPhoneOS and iPhone Simulator SDKs? My application works just fine on the simulator, but cannot compile for iPhoneOS. Foundation.framework has 124 headers on Simulator 2.1, but only 70 on iPhoneOS 2.1. What's up with that?
Thanks a lot!!!

MacRumors attracts a broad audience
of both consumers and professionals interested in
the latest technologies and products. We also boast an active community focused on
purchasing decisions and technical aspects of the iPhone, iPod, iPad, and Mac platforms.